1/* 2 * Based on LiMon - BOOTP. 3 * 4 * Copyright 1994, 1995, 2000 Neil Russell. 5 * (See License) 6 * Copyright 2000 Roland Borde 7 * Copyright 2000 Paolo Scaffardi 8 * Copyright 2000-2004 Wolfgang Denk, wd@denx.de 9 */ 10 11#include <common.h> 12#include <bootstage.h> 13#include <command.h> 14#include <env.h> 15#include <efi_loader.h> 16#include <log.h> 17#include <net.h> 18#include <rand.h> 19#include <uuid.h> 20#include <linux/delay.h> 21#include <net/tftp.h> 22#include "bootp.h" 23#ifdef CONFIG_LED_STATUS 24#include <status_led.h> 25#endif 26#ifdef CONFIG_BOOTP_RANDOM_DELAY 27#include "net_rand.h" 28#endif 29#include <malloc.h> 30 31#define BOOTP_VENDOR_MAGIC 0x63825363 /* RFC1048 Magic Cookie */ 32 33/* 34 * The timeout for the initial BOOTP/DHCP request used to be described by a 35 * counter of fixed-length timeout periods. CONFIG_NET_RETRY_COUNT represents 36 * that counter 37 * 38 * Now that the timeout periods are variable (exponential backoff and retry) 39 * we convert the timeout count to the absolute time it would have take to 40 * execute that many retries, and keep sending retry packets until that time 41 * is reached. 42 */ 43#define TIMEOUT_MS ((3 + (CONFIG_NET_RETRY_COUNT * 5)) * 1000) 44 45#ifndef CFG_DHCP_MIN_EXT_LEN /* minimal length of extension list */ 46#define CFG_DHCP_MIN_EXT_LEN 64 47#endif 48 49#ifndef CFG_BOOTP_ID_CACHE_SIZE 50#define CFG_BOOTP_ID_CACHE_SIZE 4 51#endif 52 53u32 bootp_ids[CFG_BOOTP_ID_CACHE_SIZE]; 54unsigned int bootp_num_ids; 55int bootp_try; 56ulong bootp_start; 57ulong bootp_timeout; 58char net_nis_domain[32] = {0,}; /* Our NIS domain */ 59char net_hostname[32] = {0,}; /* Our hostname */ 60char net_root_path[CONFIG_BOOTP_MAX_ROOT_PATH_LEN] = {0,}; /* Our bootpath */ 61 62static ulong time_taken_max; 63 64#if defined(CONFIG_CMD_DHCP) 65static dhcp_state_t dhcp_state = INIT; 66static u32 dhcp_leasetime; 67static struct in_addr dhcp_server_ip; 68static u8 dhcp_option_overload; 69#define OVERLOAD_FILE 1 70#define OVERLOAD_SNAME 2 71static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 72 unsigned src, unsigned len); 73 74/* For Debug */ 75#if 0 76static char *dhcpmsg2str(int type) 77{ 78 switch (type) { 79 case 1: return "DHCPDISCOVER"; break; 80 case 2: return "DHCPOFFER"; break; 81 case 3: return "DHCPREQUEST"; break; 82 case 4: return "DHCPDECLINE"; break; 83 case 5: return "DHCPACK"; break; 84 case 6: return "DHCPNACK"; break; 85 case 7: return "DHCPRELEASE"; break; 86 default: return "UNKNOWN/INVALID MSG TYPE"; break; 87 } 88} 89#endif 90#endif 91 92static void bootp_add_id(ulong id) 93{ 94 if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) { 95 size_t size = sizeof(bootp_ids) - sizeof(id); 96 97 memmove(bootp_ids, &bootp_ids[1], size); 98 bootp_ids[bootp_num_ids - 1] = id; 99 } else { 100 bootp_ids[bootp_num_ids] = id; 101 bootp_num_ids++; 102 } 103} 104 105static bool bootp_match_id(ulong id) 106{ 107 unsigned int i; 108 109 for (i = 0; i < bootp_num_ids; i++) 110 if (bootp_ids[i] == id) 111 return true; 112 113 return false; 114} 115 116static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src, 117 unsigned len) 118{ 119 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 120 int retval = 0; 121 122 if (dest != PORT_BOOTPC || src != PORT_BOOTPS) 123 retval = -1; 124 else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE) 125 retval = -2; 126 else if (bp->bp_op != OP_BOOTREPLY) 127 retval = -3; 128 else if (bp->bp_htype != HWT_ETHER) 129 retval = -4; 130 else if (bp->bp_hlen != HWL_ETHER) 131 retval = -5; 132 else if (!bootp_match_id(net_read_u32(&bp->bp_id))) 133 retval = -6; 134 else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0) 135 retval = -7; 136 137 debug("Filtering pkt = %d\n", retval); 138 139 return retval; 140} 141 142static void store_bootp_params(struct bootp_hdr *bp) 143{ 144 struct in_addr tmp_ip; 145 bool overwrite_serverip = true; 146 147 if (IS_ENABLED(CONFIG_BOOTP_SERVERIP)) 148 return; 149 150#if defined(CONFIG_BOOTP_PREFER_SERVERIP) 151 overwrite_serverip = false; 152#endif 153 154 net_copy_ip(&tmp_ip, &bp->bp_siaddr); 155 if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr)) 156 net_copy_ip(&net_server_ip, &bp->bp_siaddr); 157 memcpy(net_server_ethaddr, 158 ((struct ethernet_hdr *)net_rx_packet)->et_src, 6); 159 if ( 160#if defined(CONFIG_CMD_DHCP) 161 !(dhcp_option_overload & OVERLOAD_FILE) && 162#endif 163 (strlen(bp->bp_file) > 0) && 164 !net_boot_file_name_explicit) { 165 copy_filename(net_boot_file_name, bp->bp_file, 166 sizeof(net_boot_file_name)); 167 } 168 169 debug("net_boot_file_name: %s\n", net_boot_file_name); 170 171 /* Propagate to environment: 172 * don't delete exising entry when BOOTP / DHCP reply does 173 * not contain a new value 174 */ 175 if (*net_boot_file_name) 176 env_set("bootfile", net_boot_file_name); 177} 178 179/* 180 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet 181 */ 182static void store_net_params(struct bootp_hdr *bp) 183{ 184#if !defined(CONFIG_SERVERIP_FROM_PROXYDHCP) 185 store_bootp_params(bp); 186#endif 187 net_copy_ip(&net_ip, &bp->bp_yiaddr); 188} 189 190static int truncate_sz(const char *name, int maxlen, int curlen) 191{ 192 if (curlen >= maxlen) { 193 printf("*** WARNING: %s is too long (%d - max: %d)" 194 " - truncated\n", name, curlen, maxlen); 195 curlen = maxlen - 1; 196 } 197 return curlen; 198} 199 200#if !defined(CONFIG_CMD_DHCP) 201 202static void bootp_process_vendor_field(u8 *ext) 203{ 204 int size = *(ext + 1); 205 206 debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, 207 *(ext + 1)); 208 209 net_boot_file_expected_size_in_blocks = 0; 210 211 switch (*ext) { 212 /* Fixed length fields */ 213 case 1: /* Subnet mask */ 214 if (net_netmask.s_addr == 0) 215 net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2)); 216 break; 217 case 2: /* Time offset - Not yet supported */ 218 break; 219 /* Variable length fields */ 220 case 3: /* Gateways list */ 221 if (net_gateway.s_addr == 0) 222 net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2)); 223 break; 224 case 4: /* Time server - Not yet supported */ 225 break; 226 case 5: /* IEN-116 name server - Not yet supported */ 227 break; 228 case 6: 229 if (net_dns_server.s_addr == 0) 230 net_copy_ip(&net_dns_server, 231 (struct in_addr *)(ext + 2)); 232#if defined(CONFIG_BOOTP_DNS2) 233 if ((net_dns_server2.s_addr == 0) && (size > 4)) 234 net_copy_ip(&net_dns_server2, 235 (struct in_addr *)(ext + 2 + 4)); 236#endif 237 break; 238 case 7: /* Log server - Not yet supported */ 239 break; 240 case 8: /* Cookie/Quote server - Not yet supported */ 241 break; 242 case 9: /* LPR server - Not yet supported */ 243 break; 244 case 10: /* Impress server - Not yet supported */ 245 break; 246 case 11: /* RPL server - Not yet supported */ 247 break; 248 case 12: /* Host name */ 249 if (net_hostname[0] == 0) { 250 size = truncate_sz("Host Name", 251 sizeof(net_hostname), size); 252 memcpy(&net_hostname, ext + 2, size); 253 net_hostname[size] = 0; 254 } 255 break; 256 case 13: /* Boot file size */ 257 if (size == 2) 258 net_boot_file_expected_size_in_blocks = 259 ntohs(*(ushort *)(ext + 2)); 260 else if (size == 4) 261 net_boot_file_expected_size_in_blocks = 262 ntohl(*(ulong *)(ext + 2)); 263 break; 264 case 14: /* Merit dump file - Not yet supported */ 265 break; 266 case 15: /* Domain name - Not yet supported */ 267 break; 268 case 16: /* Swap server - Not yet supported */ 269 break; 270 case 17: /* Root path */ 271 if (net_root_path[0] == 0) { 272 size = truncate_sz("Root Path", 273 sizeof(net_root_path), size); 274 memcpy(&net_root_path, ext + 2, size); 275 net_root_path[size] = 0; 276 } 277 break; 278 case 18: /* Extension path - Not yet supported */ 279 /* 280 * This can be used to send the information of the 281 * vendor area in another file that the client can 282 * access via TFTP. 283 */ 284 break; 285 /* IP host layer fields */ 286 case 40: /* NIS Domain name */ 287 if (net_nis_domain[0] == 0) { 288 size = truncate_sz("NIS Domain Name", 289 sizeof(net_nis_domain), size); 290 memcpy(&net_nis_domain, ext + 2, size); 291 net_nis_domain[size] = 0; 292 } 293 break; 294#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 295 case 42: /* NTP server IP */ 296 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2)); 297 break; 298#endif 299 /* Application layer fields */ 300 case 43: /* Vendor specific info - Not yet supported */ 301 /* 302 * Binary information to exchange specific 303 * product information. 304 */ 305 break; 306 /* Reserved (custom) fields (128..254) */ 307 } 308} 309 310static void bootp_process_vendor(u8 *ext, int size) 311{ 312 u8 *end = ext + size; 313 314 debug("[BOOTP] Checking extension (%d bytes)...\n", size); 315 316 while ((ext < end) && (*ext != 0xff)) { 317 if (*ext == 0) { 318 ext++; 319 } else { 320 u8 *opt = ext; 321 322 ext += ext[1] + 2; 323 if (ext <= end) 324 bootp_process_vendor_field(opt); 325 } 326 } 327 328 debug("[BOOTP] Received fields:\n"); 329 if (net_netmask.s_addr) 330 debug("net_netmask : %pI4\n", &net_netmask); 331 332 if (net_gateway.s_addr) 333 debug("net_gateway : %pI4", &net_gateway); 334 335 if (net_boot_file_expected_size_in_blocks) 336 debug("net_boot_file_expected_size_in_blocks : %d\n", 337 net_boot_file_expected_size_in_blocks); 338 339 if (net_hostname[0]) 340 debug("net_hostname : %s\n", net_hostname); 341 342 if (net_root_path[0]) 343 debug("net_root_path : %s\n", net_root_path); 344 345 if (net_nis_domain[0]) 346 debug("net_nis_domain : %s\n", net_nis_domain); 347 348#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 349 if (net_ntp_server.s_addr) 350 debug("net_ntp_server : %pI4\n", &net_ntp_server); 351#endif 352} 353 354/* 355 * Handle a BOOTP received packet. 356 */ 357static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 358 unsigned src, unsigned len) 359{ 360 struct bootp_hdr *bp; 361 362 debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n", 363 src, dest, len, sizeof(struct bootp_hdr)); 364 365 bp = (struct bootp_hdr *)pkt; 366 367 /* Filter out pkts we don't want */ 368 if (check_reply_packet(pkt, dest, src, len)) 369 return; 370 371 /* 372 * Got a good BOOTP reply. Copy the data into our variables. 373 */ 374#if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE) 375 status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF); 376#endif 377 378 store_net_params(bp); /* Store net parameters from reply */ 379 380 /* Retrieve extended information (we must parse the vendor area) */ 381 if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC)) 382 bootp_process_vendor((uchar *)&bp->bp_vend[4], len); 383 384 net_set_timeout_handler(0, (thand_f *)0); 385 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop"); 386 387 debug("Got good BOOTP\n"); 388 389 net_auto_load(); 390} 391#endif 392 393/* 394 * Timeout on BOOTP/DHCP request. 395 */ 396static void bootp_timeout_handler(void) 397{ 398 ulong time_taken = get_timer(bootp_start); 399 400 if (time_taken >= time_taken_max) { 401#ifdef CONFIG_BOOTP_MAY_FAIL 402 char *ethrotate; 403 404 ethrotate = env_get("ethrotate"); 405 if ((ethrotate && strcmp(ethrotate, "no") == 0) || 406 net_restart_wrap) { 407 puts("\nRetry time exceeded\n"); 408 net_set_state(NETLOOP_FAIL); 409 } else 410#endif 411 { 412 puts("\nRetry time exceeded; starting again\n"); 413 net_start_again(); 414 } 415 } else { 416 bootp_timeout *= 2; 417 if (bootp_timeout > 2000) 418 bootp_timeout = 2000; 419 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 420 bootp_request(); 421 } 422} 423 424#define put_vci(e, str) \ 425 do { \ 426 size_t vci_strlen = strlen(str); \ 427 *e++ = 60; /* Vendor Class Identifier */ \ 428 *e++ = vci_strlen; \ 429 memcpy(e, str, vci_strlen); \ 430 e += vci_strlen; \ 431 } while (0) 432 433static u8 *add_vci(u8 *e) 434{ 435 char *vci = NULL; 436 char *env_vci = env_get("bootp_vci"); 437 438#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING) 439 vci = CONFIG_SPL_NET_VCI_STRING; 440#elif defined(CONFIG_BOOTP_VCI_STRING) 441 vci = CONFIG_BOOTP_VCI_STRING; 442#endif 443 444 if (env_vci) 445 vci = env_vci; 446 447 if (vci) 448 put_vci(e, vci); 449 450 return e; 451} 452 453/* 454 * Initialize BOOTP extension fields in the request. 455 */ 456#if defined(CONFIG_CMD_DHCP) 457static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip, 458 struct in_addr requested_ip) 459{ 460 u8 *start = e; 461 u8 *cnt; 462#ifdef CONFIG_LIB_UUID 463 char *uuid; 464#endif 465 int clientarch = -1; 466 467#if defined(CONFIG_BOOTP_VENDOREX) 468 u8 *x; 469#endif 470#if defined(CONFIG_BOOTP_SEND_HOSTNAME) 471 char *hostname; 472#endif 473 474 *e++ = 99; /* RFC1048 Magic Cookie */ 475 *e++ = 130; 476 *e++ = 83; 477 *e++ = 99; 478 479 *e++ = 53; /* DHCP Message Type */ 480 *e++ = 1; 481 *e++ = message_type; 482 483 *e++ = 57; /* Maximum DHCP Message Size */ 484 *e++ = 2; 485 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8; 486 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 487 488 if (server_ip.s_addr) { 489 int tmp = ntohl(server_ip.s_addr); 490 491 *e++ = 54; /* ServerID */ 492 *e++ = 4; 493 *e++ = tmp >> 24; 494 *e++ = tmp >> 16; 495 *e++ = tmp >> 8; 496 *e++ = tmp & 0xff; 497 } 498 499 if (requested_ip.s_addr) { 500 int tmp = ntohl(requested_ip.s_addr); 501 502 *e++ = 50; /* Requested IP */ 503 *e++ = 4; 504 *e++ = tmp >> 24; 505 *e++ = tmp >> 16; 506 *e++ = tmp >> 8; 507 *e++ = tmp & 0xff; 508 } 509#if defined(CONFIG_BOOTP_SEND_HOSTNAME) 510 hostname = env_get("hostname"); 511 if (hostname) { 512 int hostnamelen = strlen(hostname); 513 514 *e++ = 12; /* Hostname */ 515 *e++ = hostnamelen; 516 memcpy(e, hostname, hostnamelen); 517 e += hostnamelen; 518 } 519#endif 520 521#ifdef CONFIG_BOOTP_PXE_CLIENTARCH 522 clientarch = CONFIG_BOOTP_PXE_CLIENTARCH; 523#endif 524 525 if (env_get("bootp_arch")) 526 clientarch = env_get_ulong("bootp_arch", 16, clientarch); 527 528 if (clientarch > 0) { 529 *e++ = 93; /* Client System Architecture */ 530 *e++ = 2; 531 *e++ = (clientarch >> 8) & 0xff; 532 *e++ = clientarch & 0xff; 533 } 534 535 *e++ = 94; /* Client Network Interface Identifier */ 536 *e++ = 3; 537 *e++ = 1; /* type field for UNDI */ 538 *e++ = 0; /* major revision */ 539 *e++ = 0; /* minor revision */ 540 541#ifdef CONFIG_LIB_UUID 542 uuid = env_get("pxeuuid"); 543 544 if (uuid) { 545 if (uuid_str_valid(uuid)) { 546 *e++ = 97; /* Client Machine Identifier */ 547 *e++ = 17; 548 *e++ = 0; /* type 0 - UUID */ 549 550 uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD); 551 e += 16; 552 } else { 553 printf("Invalid pxeuuid: %s\n", uuid); 554 } 555 } 556#endif 557 558 e = add_vci(e); 559 560#if defined(CONFIG_BOOTP_VENDOREX) 561 x = dhcp_vendorex_prep(e); 562 if (x) 563 return x - start; 564#endif 565 566 *e++ = 55; /* Parameter Request List */ 567 cnt = e++; /* Pointer to count of requested items */ 568 *cnt = 0; 569#if defined(CONFIG_BOOTP_SUBNETMASK) 570 *e++ = 1; /* Subnet Mask */ 571 *cnt += 1; 572#endif 573#if defined(CONFIG_BOOTP_TIMEOFFSET) 574 *e++ = 2; 575 *cnt += 1; 576#endif 577#if defined(CONFIG_BOOTP_GATEWAY) 578 *e++ = 3; /* Router Option */ 579 *cnt += 1; 580#endif 581#if defined(CONFIG_BOOTP_DNS) 582 *e++ = 6; /* DNS Server(s) */ 583 *cnt += 1; 584#endif 585#if defined(CONFIG_BOOTP_HOSTNAME) 586 *e++ = 12; /* Hostname */ 587 *cnt += 1; 588#endif 589#if defined(CONFIG_BOOTP_BOOTFILESIZE) 590 *e++ = 13; /* Boot File Size */ 591 *cnt += 1; 592#endif 593#if defined(CONFIG_BOOTP_BOOTPATH) 594 *e++ = 17; /* Boot path */ 595 *cnt += 1; 596#endif 597#if defined(CONFIG_BOOTP_NISDOMAIN) 598 *e++ = 40; /* NIS Domain name request */ 599 *cnt += 1; 600#endif 601#if defined(CONFIG_BOOTP_NTPSERVER) 602 *e++ = 42; 603 *cnt += 1; 604#endif 605 if (IS_ENABLED(CONFIG_BOOTP_PXE_DHCP_OPTION)) { 606 *e++ = 209; /* PXELINUX Config File */ 607 *cnt += 1; 608 } 609 /* no options, so back up to avoid sending an empty request list */ 610 if (*cnt == 0) 611 e -= 2; 612 613 *e++ = 255; /* End of the list */ 614 615 /* Pad to minimal length */ 616#ifdef CFG_DHCP_MIN_EXT_LEN 617 while ((e - start) < CFG_DHCP_MIN_EXT_LEN) 618 *e++ = 0; 619#endif 620 621 return e - start; 622} 623 624#else 625/* 626 * Warning: no field size check - change CONFIG_BOOTP_* at your own risk! 627 */ 628static int bootp_extended(u8 *e) 629{ 630 u8 *start = e; 631 632 *e++ = 99; /* RFC1048 Magic Cookie */ 633 *e++ = 130; 634 *e++ = 83; 635 *e++ = 99; 636 637#if defined(CONFIG_CMD_DHCP) 638 *e++ = 53; /* DHCP Message Type */ 639 *e++ = 1; 640 *e++ = DHCP_DISCOVER; 641 642 *e++ = 57; /* Maximum DHCP Message Size */ 643 *e++ = 2; 644 *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16; 645 *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff; 646#endif 647 648 e = add_vci(e); 649 650#if defined(CONFIG_BOOTP_SUBNETMASK) 651 *e++ = 1; /* Subnet mask request */ 652 *e++ = 4; 653 e += 4; 654#endif 655 656#if defined(CONFIG_BOOTP_GATEWAY) 657 *e++ = 3; /* Default gateway request */ 658 *e++ = 4; 659 e += 4; 660#endif 661 662#if defined(CONFIG_BOOTP_DNS) 663 *e++ = 6; /* Domain Name Server */ 664 *e++ = 4; 665 e += 4; 666#endif 667 668#if defined(CONFIG_BOOTP_HOSTNAME) 669 *e++ = 12; /* Host name request */ 670 *e++ = 32; 671 e += 32; 672#endif 673 674#if defined(CONFIG_BOOTP_BOOTFILESIZE) 675 *e++ = 13; /* Boot file size */ 676 *e++ = 2; 677 e += 2; 678#endif 679 680#if defined(CONFIG_BOOTP_BOOTPATH) 681 *e++ = 17; /* Boot path */ 682 *e++ = 32; 683 e += 32; 684#endif 685 686#if defined(CONFIG_BOOTP_NISDOMAIN) 687 *e++ = 40; /* NIS Domain name request */ 688 *e++ = 32; 689 e += 32; 690#endif 691#if defined(CONFIG_BOOTP_NTPSERVER) 692 *e++ = 42; 693 *e++ = 4; 694 e += 4; 695#endif 696 697 *e++ = 255; /* End of the list */ 698 699 /* 700 * If nothing in list, remove it altogether. Some DHCP servers get 701 * upset by this minor faux pas and do not respond at all. 702 */ 703 if (e == start + 3) { 704 printf("*** Warning: no DHCP options requested\n"); 705 e -= 3; 706 } 707 708 return e - start; 709} 710#endif 711 712void bootp_reset(void) 713{ 714 bootp_num_ids = 0; 715 bootp_try = 0; 716 bootp_start = get_timer(0); 717 bootp_timeout = 250; 718} 719 720void bootp_request(void) 721{ 722 uchar *pkt, *iphdr; 723 struct bootp_hdr *bp; 724 int extlen, pktlen, iplen; 725 int eth_hdr_size; 726#ifdef CONFIG_BOOTP_RANDOM_DELAY 727 ulong rand_ms; 728#endif 729 u32 bootp_id; 730 struct in_addr zero_ip; 731 struct in_addr bcast_ip; 732 char *ep; /* Environment pointer */ 733 734 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start"); 735#if defined(CONFIG_CMD_DHCP) 736 dhcp_state = INIT; 737#endif 738 739 ep = env_get("bootpretryperiod"); 740 if (ep != NULL) 741 time_taken_max = dectoul(ep, NULL); 742 else 743 time_taken_max = TIMEOUT_MS; 744 745#ifdef CONFIG_BOOTP_RANDOM_DELAY /* Random BOOTP delay */ 746 if (bootp_try == 0) 747 srand_mac(); 748 749 if (bootp_try <= 2) /* Start with max 1024 * 1ms */ 750 rand_ms = rand() >> (22 - bootp_try); 751 else /* After 3rd BOOTP request max 8192 * 1ms */ 752 rand_ms = rand() >> 19; 753 754 printf("Random delay: %ld ms...\n", rand_ms); 755 mdelay(rand_ms); 756 757#endif /* CONFIG_BOOTP_RANDOM_DELAY */ 758 759 printf("BOOTP broadcast %d\n", ++bootp_try); 760 pkt = net_tx_packet; 761 memset((void *)pkt, 0, PKTSIZE); 762 763 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 764 pkt += eth_hdr_size; 765 766 /* 767 * Next line results in incorrect packet size being transmitted, 768 * resulting in errors in some DHCP servers, reporting missing bytes. 769 * Size must be set in packet header after extension length has been 770 * determined. 771 * C. Hallinan, DS4.COM, Inc. 772 */ 773 /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, 774 sizeof (struct bootp_hdr)); */ 775 iphdr = pkt; /* We need this later for net_set_udp_header() */ 776 pkt += IP_UDP_HDR_SIZE; 777 778 bp = (struct bootp_hdr *)pkt; 779 bp->bp_op = OP_BOOTREQUEST; 780 bp->bp_htype = HWT_ETHER; 781 bp->bp_hlen = HWL_ETHER; 782 bp->bp_hops = 0; 783 /* 784 * according to RFC1542, should be 0 on first request, secs since 785 * first request otherwise 786 */ 787 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 788 zero_ip.s_addr = 0; 789 net_write_ip(&bp->bp_ciaddr, zero_ip); 790 net_write_ip(&bp->bp_yiaddr, zero_ip); 791 net_write_ip(&bp->bp_siaddr, zero_ip); 792 net_write_ip(&bp->bp_giaddr, zero_ip); 793 memcpy(bp->bp_chaddr, net_ethaddr, 6); 794 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 795 796 /* Request additional information from the BOOTP/DHCP server */ 797#if defined(CONFIG_CMD_DHCP) 798 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip, 799 zero_ip); 800#else 801 extlen = bootp_extended((u8 *)bp->bp_vend); 802#endif 803 804 /* 805 * Bootp ID is the lower 4 bytes of our ethernet address 806 * plus the current time in ms. 807 */ 808 bootp_id = ((u32)net_ethaddr[2] << 24) 809 | ((u32)net_ethaddr[3] << 16) 810 | ((u32)net_ethaddr[4] << 8) 811 | (u32)net_ethaddr[5]; 812 bootp_id += get_timer(0); 813 bootp_id = htonl(bootp_id); 814 bootp_add_id(bootp_id); 815 net_copy_u32(&bp->bp_id, &bootp_id); 816 817 /* 818 * Calculate proper packet lengths taking into account the 819 * variable size of the options field 820 */ 821 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 822 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 823 bcast_ip.s_addr = 0xFFFFFFFFL; 824 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 825 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler); 826 827#if defined(CONFIG_CMD_DHCP) 828 dhcp_state = SELECTING; 829 net_set_udp_handler(dhcp_handler); 830#else 831 net_set_udp_handler(bootp_handler); 832#endif 833 net_send_packet(net_tx_packet, pktlen); 834} 835 836#if defined(CONFIG_CMD_DHCP) 837static void dhcp_process_options(uchar *popt, uchar *end) 838{ 839 int oplen, size; 840#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 841 int *to_ptr; 842#endif 843 844 while (popt < end && *popt != 0xff) { 845 oplen = *(popt + 1); 846 switch (*popt) { 847 case 0: 848 oplen = -1; /* Pad omits len byte */ 849 break; 850 case 1: 851 net_copy_ip(&net_netmask, (popt + 2)); 852 break; 853#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET) 854 case 2: /* Time offset */ 855 to_ptr = &net_ntp_time_offset; 856 net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2)); 857 net_ntp_time_offset = ntohl(net_ntp_time_offset); 858 break; 859#endif 860 case 3: 861 net_copy_ip(&net_gateway, (popt + 2)); 862 break; 863 case 6: 864 net_copy_ip(&net_dns_server, (popt + 2)); 865#if defined(CONFIG_BOOTP_DNS2) 866 if (*(popt + 1) > 4) 867 net_copy_ip(&net_dns_server2, (popt + 2 + 4)); 868#endif 869 break; 870 case 12: 871 size = truncate_sz("Host Name", 872 sizeof(net_hostname), oplen); 873 memcpy(&net_hostname, popt + 2, size); 874 net_hostname[size] = 0; 875 break; 876 case 15: /* Ignore Domain Name Option */ 877 break; 878 case 17: 879 size = truncate_sz("Root Path", 880 sizeof(net_root_path), oplen); 881 memcpy(&net_root_path, popt + 2, size); 882 net_root_path[size] = 0; 883 break; 884 case 28: /* Ignore Broadcast Address Option */ 885 break; 886 case 40: /* NIS Domain name */ 887 if (net_nis_domain[0] == 0) { 888 size = truncate_sz("NIS Domain Name", 889 sizeof(net_nis_domain), size); 890 memcpy(&net_nis_domain, popt + 2, size); 891 net_nis_domain[size] = 0; 892 } 893 break; 894#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER) 895 case 42: /* NTP server IP */ 896 net_copy_ip(&net_ntp_server, (popt + 2)); 897 break; 898#endif 899 case 51: 900 net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2)); 901 break; 902 case 52: 903 dhcp_option_overload = popt[2]; 904 break; 905 case 53: /* Ignore Message Type Option */ 906 break; 907 case 54: 908 net_copy_ip(&dhcp_server_ip, (popt + 2)); 909 break; 910 case 58: /* Ignore Renewal Time Option */ 911 break; 912 case 59: /* Ignore Rebinding Time Option */ 913 break; 914 case 66: /* Ignore TFTP server name */ 915 break; 916 case 67: /* Bootfile option */ 917 if (!net_boot_file_name_explicit) { 918 size = truncate_sz("Bootfile", 919 sizeof(net_boot_file_name), 920 oplen); 921 memcpy(&net_boot_file_name, popt + 2, size); 922 net_boot_file_name[size] = 0; 923 } 924 break; 925 case 209: /* PXELINUX Config File */ 926 if (IS_ENABLED(CONFIG_BOOTP_PXE_DHCP_OPTION)) { 927 /* In case it has already been allocated when get DHCP Offer packet, 928 * free first to avoid memory leak. 929 */ 930 if (pxelinux_configfile) 931 free(pxelinux_configfile); 932 933 pxelinux_configfile = (char *)malloc((oplen + 1) * sizeof(char)); 934 935 if (pxelinux_configfile) 936 strlcpy(pxelinux_configfile, popt + 2, oplen + 1); 937 else 938 printf("Error: Failed to allocate pxelinux_configfile\n"); 939 } 940 break; 941 default: 942#if defined(CONFIG_BOOTP_VENDOREX) 943 if (dhcp_vendorex_proc(popt)) 944 break; 945#endif 946 printf("*** Unhandled DHCP Option in OFFER/ACK:" 947 " %d\n", *popt); 948 break; 949 } 950 popt += oplen + 2; /* Process next option */ 951 } 952} 953 954static void dhcp_packet_process_options(struct bootp_hdr *bp) 955{ 956 uchar *popt = (uchar *)&bp->bp_vend[4]; 957 uchar *end = popt + BOOTP_HDR_SIZE; 958 959 if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC)) 960 return; 961 962 dhcp_option_overload = 0; 963 964 /* 965 * The 'options' field MUST be interpreted first, 'file' next, 966 * 'sname' last. 967 */ 968 dhcp_process_options(popt, end); 969 970 if (dhcp_option_overload & OVERLOAD_FILE) { 971 popt = (uchar *)bp->bp_file; 972 end = popt + sizeof(bp->bp_file); 973 dhcp_process_options(popt, end); 974 } 975 976 if (dhcp_option_overload & OVERLOAD_SNAME) { 977 popt = (uchar *)bp->bp_sname; 978 end = popt + sizeof(bp->bp_sname); 979 dhcp_process_options(popt, end); 980 } 981} 982 983static int dhcp_message_type(unsigned char *popt) 984{ 985 if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC)) 986 return -1; 987 988 popt += 4; 989 while (*popt != 0xff) { 990 if (*popt == 53) /* DHCP Message Type */ 991 return *(popt + 2); 992 if (*popt == 0) { 993 /* Pad */ 994 popt += 1; 995 } else { 996 /* Scan through all options */ 997 popt += *(popt + 1) + 2; 998 } 999 } 1000 return -1; 1001} 1002 1003static void dhcp_send_request_packet(struct bootp_hdr *bp_offer) 1004{ 1005 uchar *pkt, *iphdr; 1006 struct bootp_hdr *bp; 1007 int pktlen, iplen, extlen; 1008 int eth_hdr_size; 1009 struct in_addr offered_ip; 1010 struct in_addr zero_ip; 1011 struct in_addr bcast_ip; 1012 1013 debug("dhcp_send_request_packet: Sending DHCPREQUEST\n"); 1014 pkt = net_tx_packet; 1015 memset((void *)pkt, 0, PKTSIZE); 1016 1017 eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP); 1018 pkt += eth_hdr_size; 1019 1020 iphdr = pkt; /* We'll need this later to set proper pkt size */ 1021 pkt += IP_UDP_HDR_SIZE; 1022 1023 bp = (struct bootp_hdr *)pkt; 1024 bp->bp_op = OP_BOOTREQUEST; 1025 bp->bp_htype = HWT_ETHER; 1026 bp->bp_hlen = HWL_ETHER; 1027 bp->bp_hops = 0; 1028 bp->bp_secs = htons(get_timer(bootp_start) / 1000); 1029 /* Do not set the client IP, your IP, or server IP yet, since it 1030 * hasn't been ACK'ed by the server yet */ 1031 1032 /* 1033 * RFC3046 requires Relay Agents to discard packets with 1034 * nonzero and offered giaddr 1035 */ 1036 zero_ip.s_addr = 0; 1037 net_write_ip(&bp->bp_giaddr, zero_ip); 1038 1039 memcpy(bp->bp_chaddr, net_ethaddr, 6); 1040 copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file)); 1041 1042 /* 1043 * ID is the id of the OFFER packet 1044 */ 1045 1046 net_copy_u32(&bp->bp_id, &bp_offer->bp_id); 1047 1048 /* 1049 * Copy options from OFFER packet if present 1050 */ 1051 1052 /* Copy offered IP into the parameters request list */ 1053 net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr); 1054 extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, 1055 dhcp_server_ip, offered_ip); 1056 1057 iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen; 1058 pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen; 1059 bcast_ip.s_addr = 0xFFFFFFFFL; 1060 net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen); 1061 1062 debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen); 1063 net_send_packet(net_tx_packet, pktlen); 1064} 1065 1066/* 1067 * Handle DHCP received packets. 1068 */ 1069static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip, 1070 unsigned src, unsigned len) 1071{ 1072 struct bootp_hdr *bp = (struct bootp_hdr *)pkt; 1073 1074 debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n", 1075 src, dest, len, dhcp_state); 1076 1077 /* Filter out pkts we don't want */ 1078 if (check_reply_packet(pkt, dest, src, len)) 1079 return; 1080 1081 debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: " 1082 "%d\n", src, dest, len, dhcp_state); 1083 1084 if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) { 1085#if defined(CONFIG_SERVERIP_FROM_PROXYDHCP) 1086 store_bootp_params(bp); 1087#endif 1088 return; 1089 } 1090 1091 switch (dhcp_state) { 1092 case SELECTING: 1093 /* 1094 * Wait an appropriate time for any potential DHCPOFFER packets 1095 * to arrive. Then select one, and generate DHCPREQUEST 1096 * response. If filename is in format we recognize, assume it 1097 * is a valid OFFER from a server we want. 1098 */ 1099 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file); 1100#ifdef CONFIG_SYS_BOOTFILE_PREFIX 1101 if (strncmp(bp->bp_file, 1102 CONFIG_SYS_BOOTFILE_PREFIX, 1103 strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) { 1104#endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1105 if (CONFIG_IS_ENABLED(UNIT_TEST) && 1106 dhcp_message_type((u8 *)bp->bp_vend) == -1) { 1107 debug("got BOOTP response; transitioning to BOUND\n"); 1108 goto dhcp_got_bootp; 1109 } 1110 dhcp_packet_process_options(bp); 1111 if (CONFIG_IS_ENABLED(EFI_LOADER) && 1112 IS_ENABLED(CONFIG_NETDEVICES)) 1113 efi_net_set_dhcp_ack(pkt, len); 1114 1115#if defined(CONFIG_SERVERIP_FROM_PROXYDHCP) 1116 if (!net_server_ip.s_addr) 1117 udelay(CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS * 1118 1000); 1119#endif /* CONFIG_SERVERIP_FROM_PROXYDHCP */ 1120 1121 debug("TRANSITIONING TO REQUESTING STATE\n"); 1122 dhcp_state = REQUESTING; 1123 1124 net_set_timeout_handler(5000, bootp_timeout_handler); 1125 dhcp_send_request_packet(bp); 1126#ifdef CONFIG_SYS_BOOTFILE_PREFIX 1127 } 1128#endif /* CONFIG_SYS_BOOTFILE_PREFIX */ 1129 1130 return; 1131 break; 1132 case REQUESTING: 1133 debug("DHCP State: REQUESTING\n"); 1134 1135 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) { 1136dhcp_got_bootp: 1137 dhcp_packet_process_options(bp); 1138 /* Store net params from reply */ 1139 store_net_params(bp); 1140 dhcp_state = BOUND; 1141 printf("DHCP client bound to address %pI4 (%lu ms)\n", 1142 &net_ip, get_timer(bootp_start)); 1143 net_set_timeout_handler(0, (thand_f *)0); 1144 bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, 1145 "bootp_stop"); 1146 1147 net_auto_load(); 1148 return; 1149 } 1150 break; 1151 case BOUND: 1152 /* DHCP client bound to address */ 1153 break; 1154 default: 1155 puts("DHCP: INVALID STATE\n"); 1156 break; 1157 } 1158} 1159 1160void dhcp_request(void) 1161{ 1162 bootp_request(); 1163} 1164#endif /* CONFIG_CMD_DHCP */ 1165